Pivot bearing



Dan 15,, a ws zrzaiax s. HURT PIVOT BEARING Filed Dec. 10 1919 5mm for Patented lilac. 18 1923.

UNITED "STATES.

PATENT OFFICE.

SAMUEL N. HURT, OF TOLEDO, OHIO, ASSIGNOB TO TOLEDO SCALE'OOMPANY, TOLEDO, OHIO, A CORPORATION OF NEW JERSEY.

PIVOT BEARING.

Application filed December 10, 1919. semi Io. mp1s.

To cZZ whom it may concern:

Be it 'lrnownthat I SAMUEL N. HURT, a

'cltizen of the United States, residing at' loledo, in the county of Lucas and State of I Ohio, havev invented certain new and useful Improvements in Pivot Bearings, of which the following is a Specification.

This invention relates to pivot bearings,

and more particularly to the mountings of\ l agate or jewel bearings such as are used in sensitive weighing scales and in horological and other scientific instruments. Such bearings are commonly provided with V-shaped grooves adapted to receive knife-edge pivots of hardened steel or other suitable material,

and in order that the rocking movement of thepivot on thebearing may be frictionless, it is necessary that the lines formed respectively bytheedge of the pivot and the.

bottom 61' the groove be substantially c0- incident. One of the objectsof this invention is to provide means for automatically aligning-the knife edges and V-grooves ofsuch pivots and bearings.

Another object of the invention is to so construct'the device that the agate or jewel bearings may be accurately positioned in their supporting bringother parts of the machine into proper relation.

Owing to the brittle character of bearin of this type it has been found preferab e .to secure them to the metal of the instrument by setting them in cement, the common practice bein to cement them in sockets formed directly 1n the frame or other part to which they are secured. This necessitates handling the entire frame several times during the setting of each bearing, and since the cement settingmustbe given time to cure, it also neces sitates maintaining a larger stock of the metal frame parts than would otherwise be necessary. Another object of the invention is to provide a structure in which the bearings are mounted in small clips which are readi y attachable to the frame by means which insures proper alignment of the bearing grooves, whereby the cementing and curing can 'be finished while detached from the 59 larger scale parts.

Other objects and advantages will be apframes and adjusted to parent from the following description, in which referenceis had to the accompanying drawin illustrating a preferred embodi-- ment 0 my invention and wherein similar reference numerals designate similar parts throughout the several views.

In the drawing Figure 1 is a plan view of a part-of a scale frame provided with a bearing mouhting embodying my invention;

Figure 2 is a fragmentary side elevation of the same.

Figure 3 is .a fragmentary vertical section taken substantially on the line 33 of Figure 1;

Figure 4 is a view in perspective of an agate bearing and carrying clip removed from the frame;

Figure 5 is a'perspect'ive view of a rock shelft forming an element of my invention; an

' Figure 6 is a frontelevation on a reduced scale of a fragment of the machine frame shown in Figure 2.

I have, for the purpose of illustration,

shown my invention as applied to the base horn or fulcrum stand 1 of a weighing scale, but it is to be understood that the showing is merely exemplatory and that I contemplate the use of the invention wherever applicable.

The fulcrum stand 1 is shown as provided with an adjustable thrust bearing 2 of the type illustrated in detail in U. S. Patent No. 1,294,450, to Hapgood, February 18, 1919'. Since my invention does not reside in the thrust hearing per so, I will not particularly describe it. As shown, the bearing to which my invention is applied is located in a recess 3 in the upper part of the fulcrum stand. One wall of this recess forms a convenient mounting for the thrust bearing 2, and when the bearing is so located the recess may be covered and the bearing and mounting of my invention thus protected and kept-clean.

It is to be understood, however, that my improved bearing mounting may be applied to frame members differently forme The stand 1 is provided with a horizontal bore 4, theupper'side of which opens into the recess 3, and lying within the bore 4 is a cylindrical rocking memqer 5 having a talit) e opening 6 substantially midends.

By loosening one of the screws ing screws l. 'l" and tightening the other the rocking memher 5 maybe moved longitudinally 1n the bore r. The .ends of the screws 7 which contact the member 5 are crowned so that they may engage the member 5 with sufiicient snugness to prevent longitudinal move- -ment' without preventing rocking movement thereof. -After the member 5 has been proerly positioned the adjusting screws 7 may. be locked in place by turning up set screws 8 (see Figure 6).

The agate bearing is mounted in a channel-shaped metallic clip 9 which preferably substantially conforms in shape to the lower til till

mains in the perforations when the agate is set assists in anchoringit in place. By the use of a suitable fixture a large number of agates may be set in clips at the same time and the height of the bottom of the V- grooves determined with great nic-ety.

ldrojecting rigidly from the bottom of the clip 9 is a frusto-conical. pin 11. The pin ll is adapted to be rotatively received in the opening 6 of the rocking member 5. When the pin 11 has been dropped into the opening 6 and the parts are in assembled relation, as shown in Figures 1, 2 and 3, it

is apparent that the agate is capable of movement about anes perpendicular to each other and to the line formed by the bottom of the ll-groove but that it is incapable of movement about any axis which is parallel to the ll-groove. Supposing the agate to be ,7

used as a fulcrum bearing for a scale lever, if the fulcrum pivot be out of alignment in any direction the bearing may turn until the line at the bottom of the "it-groove coincideswith the line at the knife edge of the pivot. When the knife edge comes into full line engagement with the bqttom'of the if-groove the bearing is held rigidly in place so that no shifting of the lever is'permitted. If,

owing to improper machining, or for other reasons, the nose of the lever does not come into plumb relation with the part to which it is to be connected, the nose of the lever 'may be swung laterally by moving the pivot on one side rearwardly and the pivot on the other side forwardly, or'the nose may be shifted forwardly or rearwardly. by moving the pivots on both sides in the same direction, the pivots being movable by manipulation of the screws 7.

While it will be apparent that the illus The opposite ends 1 ar threaded to receive ad ustunderstood that the invention is susceptible y to variation, modification and change within the spirit and scope o-fthe sub omed claims.

Having thus described my invention, l

claim: 7

1,.lln a device of the class described, in combination, a frame, connecting member rockable with respect to said frame about an axis, a second connecting member rock-- able about an axis perpendicular to the first said axis, and a line bearing menibercan,

ried by said second conn cting member, the bearing line lying perpendicular to both said axes.

2. ln a device of the class described, in combination, a frame, a supporting member rotatable relatively thereto on a horizontal axis, and a bearing carried by and rotatable relatively to said supporting member on a vertical axis.

3. lfn a device of the class described, in combination, a frame, a member mounted in said frame to rotate on a horizontal axis, a grooved bearing, and a vertical pin rotatably connecting said member and said bearing. 4b.. In a device of class described, in combination, a frame, a grooved bearing, a clip receiving said bearing, and means so connecting said clip and said frame as to permit. relative pivotal movement thereof about axes perpendicular to each other and to said groove and to hold said clip and frame against relative pivotal movement about anaxis parallel to said groove.

5. in a device of the class described, in combination,,a frame, a bearing a clip receiving said bearing, a pin projecting downwardly from saidclip, a rocking member journaled in said frame, said pin being swiveled in said rocking member.

6. In a device of the class described, in combination, albearing, a clip receiving said bearing, a pingyprojecting downwardly from said bearing,r frame having a horizontal bbre therein, and a cylindrical member lying in said bore, said pin being swivelly connectedto said cylindrical member.

-7. in a device of the class described, in combination, a frame having a horizontal bore therein, a cylindrical member lying in said bore and revoluble therein, means for adjusting said member longitudinally of said bore, and a bearing-swiveled to said member on a vertical, axis. V

8'. In a device of the class described, in combination, a frame having a horizontal bore therein, a-cylindrical member in said bore, adjusting screws threaded in said bore and bearing against the ends of said cylindrical member, said cylindrical member ill) ltlti and bearing against the ends of said cylindrical member, and a bearing clip 10- tatably mounted on said 0 Iindrical member. 10

S ML N. HURT.

Witnewas:

0. o. C. E. WILcox. 

